Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

In the engine it is necessary to grease a number of bearings and steam of friction. Engine oil is necessary for pumping over there under pressure is a duty of the oil pump. It sucks away oil from the oil pallet by means of an inlet tube and squeezes out it in the oil filter of the trunk oil main.

If the filter was not replaced in time and paper of the filter is hammered by dirt, the safety valve bypassing the oil filter opens – supply by oil is provided.

From the filter the greasing substance gets through openings in the block of cylinders to places of greasing of a cranked shaft, an intermediate shaft (only 4-cylinder engine) and heads of the block of cylinders with a camshaft. Through openings oil flows down back in the oil pallet, from where the oil pump can take away again it for the following cycle.

Oil pump

In a mode of full loading via the engine in a minute pass 30 l of oil:

• In the 4-cylinder engine already mentioned intermediate shaft is a driving element for a shaft of the distributor of ignition which transfers rotation to the oil pump.
• In 5-and the 6-cylinder engine the oil pump is located in the movement direction in front directly on cranked to a shaft.
  The way of operation of oil pumps in different Audi engines also differs.
• The 4-cylinder engine is supplied with the shesterenny oil pump. Two gear wheels of the identical size entering each other simply pump over oil from the admission party to the forcing party.
• 5-and 6-cylinder engines are greased with the rotor oil pump of Eaton system. Here the external gear wheel is located in an internal gear wheel (these are both rotors). Thanks to a special form and not coaxial arrangement of an internal rotor at joint rotation of both gear wheels new and new hollows in which the lowered pressure dominates are formed. Thanks to rotating gear wheels oil is pumped over to the target party of the pump and from there to lubricant canals.

Oil temperature

For reliable operation of the engine the oil temperature is very important. This information is however available to the driver of Audi only by means of the built-in additional devices. For the purpose of comparison the temperature of engine oil on a flange of the oil filter or in the oil pump is interesting; there oil is coldest. On piston rings temperatures to 300°С, on the contrary, can dominate.

If at you the car is equipped with the oil thermometer: Audi calls temperature in 145°С in the oil pallet as the most admissible. Provided that high-quality, engine oil corresponding to requirements is applied.

However and too low temperature of oil is harmful to the engine. In this case oil yet did not reach the full greasing ability. Therefore you after cold start whenever possible should not disperse the engine over 3500 rpm until the temperature of oil will not rise approximately to 60°С. It is considered that engine oil in comparison with cooling liquid needs approximately twice more time before it will reach the working temperature.

Pressure of oil

If in your car the oil manometer is built in, you can check pressure of oil within accuracy of measuring devices. Check conditions: seasonal oil of the class SAE 20 W/20, 80°C oil temperature, the engine rotates from 2000 rpm. You should receive the following indicators:

However behind pressure of oil in the Audi car fine supervision and without devices is conducted. Two switches care of it with a hydraulic actuator. In more detail about this monitoring system you learn Devices and auxiliary devices in head.